Cooling of reciprocating pistons



Feb. 25,, 1930. w. TOBLER 1,748,307

COOLING RECIPROCATING PISTONS Filed April 11, 1928 n, m a

P/ if/ ML/ENTER WW J ag BY Q OQ MHIM Patented Feb. 25,

uNiTED sTr Es PATENT ,o iFlcE WERNER TOBLER, or WINTER-THUR,SWITZERLAND, ASSIGNQR T0 stTLzER FRERE Y soc nrn ANONYME, or WINTERTHUR,SWITZERLAND v r oooLI'ive or nnoirnoon'rine PISTONS Application filedApril 11, 1928, Serial No. 269,246, and in Switzerland October 17, 1927.

This invention relates to the cooling of reciprocating pistons, moreparticularly those of internal combustion engines, of the kind in whichthe cooling medium is caused to circulate through or is injected intothe piston itself;

Hitherto a free jet has been arranged within the crankcase immediatelybelow the piston or flow and return pipes for ythe cooling mediumconnected to the piston and projecting vlaterally throughthe crank casehave been arranged so as tdreci'procate within .fiXed pipes outside thecrank case. "'Withsuch:

free jets it was impossible to prevent the cooling medium from leakingintothe crank case and the need for stuffing boxes on the fiXe'd pipesin the other arrangement setup stresses which tended to break thereciprocating pipes.

;The object of the present invention 'is'to provide a simpleandeificient arrangement which, whilst having the advantages of bothprevious proposals,overcoines the disadvantages from which theysufiered. i

According to 'tlllS invention'cool ng medium is suppliedin the form of afree jet outside the crank case to a pipe connected to thepiston'cooling chamber and reciprocating with the piston and'also proecting outside the crank case.

- One construct-ion according to thisinven tion'is diagrammaticallyillustrated by way of example in the accompanying drawing,

The engine illustrated comprises a'cylinder a" containing a piston'@ thecylinder being mounted upon acrank case 6 containing the 'crank shaft 03which is connected to the piston by a connecting .rod .0. Cooling.medium H is supplied to the'piston eby means of a pipe f whichreciprocates withthe piston and projeots laterally through'an opening min the Wall of the crank case being supported by an arm Z secured to thecrosshead at k; The lower end of the pipe comprises a vertical portion1?, having an enlarged mouth orfunnelshaped openingto receive a free jet9 of cooling medium which is supplied through a nozzle h on a supplypipe 2'. The jet 9 and the collector pipe 1% are enclosed within aseparate of a pipe p.

" In testimony whereof I have afi'ixed my to enter the collecting pipeor which leaks therefrom escapes from the casing 0 by means With thearrangement above described any leakage of cooling medium into the crankcase is avoided-and-thereciprocating pipe on understood that thedischarge 7 the piston is not subjected to anybending H of a pipesimilar to the supply pipe 7 adaptf jectiiig through'the crank case intoa'separate chamber having a discharge or overflow pipe.

In the case of double-acting engines thehollow piston rod is employed inthe usual ed .to reciprocate with the piston and promanner for thesupplyxand discharge of the Y cooling medium to and from the piston.

I claim: o 1. Ina cooling device fora reciprocating engine, a pistonhaving .a cooling chamber there n, a supply tube and a drain tubecommunicating with'said chamber and having their free ends disposedoutside of. the. crank .case of sa d engine an arm extending outside ofsaid crank case and carrying said tubes, said arm beingoperativelyconnected to said piston, and a'nozzle for directing a jet ofcooling medium of said supply tube.- v j 2. Ina cooling device for areciprocating engine, a piston having a cooling chamber therein, asupply tube and a drain tube eX- tendingthrough a slot in the crank caseof said engine and communicating with saidativel'y connected to saidpiston, a discharge pipe telescopically connected to the free end ofsaid drain tube, and a nozzle spaced from the free end of said supplytube and adapted to direct a; jet of cooling medium thereinto.

signature.

casing 0 and any cooling medium which fails into' the open free end '1chamber, an arm extending through said slot j and carrying said tubes,said arm being oper- I :95 WERNER TOBLER.H 1

